BCSC
Breast Cancer Surveillance Consortium: Working together to advance breast cancer research
 
Home   |   Data   |   Statistics   |   Tools   |   Collaborations   |   Work with Us   |   Publications   |   About   |   Links

Benchmarks for Abnormal Diagnostic Mammography Interpretations from 1996 - 2005 --- based on BCSC data as of 2007 by Indication for Examination*

You are viewing the 2007 collection of this data. Data from other times are also available:
  Work-Up of Abnormal Screening Examination Short-Interval Follow-Up Evaluation of Breast Problem/ No Lump or Lump Unknown Evaluation of Breast Problem/ Palpable Lump All Diagnostic Examinations
Abnormal interpretation rate (AIR) 14.9% 4.0% 6.2% 13.3% 9.6%
Readers with 10+ examinations 540 516 547 522 648
Abnormal interpretations 27,754 5,936 10,588 13,893 58,369
All examinations 186,090 147,519 170,998 104,784 611,154
AIR (Median - 50th percentile) 14.4 3.8 5.9 13.0 9.5
AIR (25th, 75th percentiles) 10.4, 20.0 2.0, 6.3 3.1, 9.3 9.0, 18.2 6.7, 12.8
AIR (10th, 90th percentiles) 7.3, 26.9 0.0, 10.0 0.0, 13.5 5.7, 25.0 4.0, 17.0
PPV1 (abnormal interpretation) 27.4% 22.2% 30.8% 44.1% 31.4%
Readers with 10+ abnormal interpretations 363 182 207 293 474
Cancers 7,392 1,112 2,911 5,695 18,140
Abnormal interpretations 27,006 5,005 9,460 12,926 57,707
PPV1 (Median - 50th percentile) 25.0 21.4 31.4 45.5 30.2
PPV1 (25th, 75th percentiles) 16.8, 32.5 14.3, 30.0 22.6, 42.9 33.3, 55.0 22.2, 38.6
PPV1 (10th, 90th percentiles) 11.8, 42.1 7.5, 37.5 15.4, 50.0 25.0, 66.7 17.0, 47.1
PPV2 (biopsy recommended)|| 27.2% 22.3% 30.9% 43.7% 31.2%
Readers with 10+ biopsy recommended 353 173 202 287 466
Cancers 7,014 1,064 2,720 5,159 16,982
Abnormal interpretations 25,831 4,767 8,809 11,809 54,456
PPV2 (Median - 50th percentile) 25.0 21.4 31.3 45.5 30.7
PPV2 (25th, 75th percentiles) 17.0, 32.5 14.3, 30.0 23.1, 42.3 33.3, 55.8 22.6, 38.9
PPV2 (10th, 90th percentiles) 11.8, 41.7 6.7, 39.1 16.3, 51.3 25.0, 66.7 17.2, 47.8
PPV3 (biopsy performed)# 31.1% 27.3% 36.1% 49.1% 35.9%
Readers with 10+ biopsy performed 303 138 140 224 404
Cancers 6,205 937 2,169 4,155 14,693
Abnormal interpretations 19,958 3,432 6,009 8,459 40,948
PPV3 (Median - 50th percentile) 30.0 27.1 37.2 52.9 35.9
PPV3 (25th, 75th percentiles) 20.3, 38.2 18.8, 35.6 27.0, 50.0 40.0, 64.7 26.8, 45.6
PPV3 (10th, 90th percentiles) 14.3, 47.4 10.3, 47.1 20.0, 59.7 30.0, 73.9 18.5, 57.3

Notes

Numbers are frequencies unless otherwise indicated. 58161 (7.4%) examinations were given an initial BI-RADS assessment of zero. The first non-zero assessment within 180 days was used as the final assessment for analysis. Examinations without a non-zero assessment within 180 days were excluded (26414,3.3%).

* Includes examinations for radiologists who interpreted at least 10 cases in a given column; excludes examinations for which the radiologist is unknown.

The number of radiologists in this column does not equal the sum of radiologists in the other column because a given radiologist may contribute to each of the preceding columns, but may contribute to this column only once.

Abnormal interpretation rate = The percentage of examinations interpreted as suspicious or highly suggestive of malignancy (BI-RADS category 4 or 5).

PPV1 = The percentage of examinations with an abnormal interpretation that results in a tissue diagnosis of cancer within 1 year.

|| PPV2 = The percentage of examinations with an abnormal interpretation and a recommendation for biopsy or surgical consultation that results in a tissue diagnosis of cancer within 1 year.

# PPV3 = The percentage of known biopsies performed as a result of an abnormal interpretation with a recommendation for biopsy or surgical consultation that results in a tissue diagnosis of cancer within 1 year.

Table numbers last updated September 19, 2007. The following source must be cited when reproducing this table: NCI-funded Breast Cancer Surveillance Consortium co-operative agreement (U01CA63740, U01CA86076, U01CA86082, U01CA63736, U01CA70013, U01CA69976, U01CA63731, U01CA70040). Downloaded xx/xx/xxxx from the Breast Cancer Surveillance Consortium Web site - http://breastscreening.cancer.gov/statistics/benchmarks/diagnostic/2007/table5.html

[Return to Performance Benchmarks for Diagnostic Mammography]